Drive for producing movement of the lay in weaving looms

ABSTRACT

For producing greater retardation at the outer dead end of the movement of a lay, a double lever system includes links pivoted to each other with one pivoted to the lay and the other to the loom frame. The second link forms one arm of an angle member, each arm of which carries a roller engaging one of two cam discs. The pivot point between the links can be adjusted to produce single or double strokes.

United States Patent 1 July 31,1973

J agei- [54] DRIVE FOR PRODUCING MOVEMENT OF 2,624,372 1/1953 Budzyna etal. 139/190 THE LAYIN WEAVING LOOMS 3,384,130 5/1968 Golobart 139/190 [75] Inventor: Hans Jiiger, Munster, Germany FOREIGN PATENTS ORAPPLICATIONS 73 Assignee; EmflJager KG Munster G y 560,993 5/l944 GreatBritain 139/190 [22] Filed: 1971 Primary Examiner-James Kee Chi [21]Appl. No.: 209,993 Att0rneyJennings Bailey, Jr.

[] Foreign Application Priority Data Jan. 15, 1971 Germany ..P 21 01720.9 [571 ABSTRACT I For producing greater retardation at the outerdead 52 U.S. Cl. 139 190 end of the movement of a a dQuble lever systemInt Cl l I Dosd 4/9/60 cludes links pivoted to each other with onepivoted to [58] Field of 's'e' rcijff. i 3 9/1 191 10s the lay and thethe The secmd 5 link forms one arm of an angle member, each arm of whichcarries a roller engaging one of two cam discs. [56] Reerences Cited Thepivot point between the links can be adjusted to UNITED STATES. PATENTSproduce single or double strokes. 2,399,728 5/1946 Fletcher 139 10Claims, 6 Drawin Figures 1,980,527 ll/l934 Hewton 139/190 X PatentedJuly 31, 1973 3,749,137

6 Sheets-Sheet 1 FIG] Patented July 31, 1973 6 Sheets-Sheet 2 FIGZPatented July 31, 1973 3,749,137

6 Sheets-Sheet 5 FIG. 3

Patented July 31, 1973 3,749,137

6 Sheets-Sheet 4 Patented July 31, 1973 6 Sheets-Sheet 5 FIGS PatentedJuly 31, 1973 3,749,137

6 Sheets-Sheet (5 FIGS DRIVE FOR PRODUCING MOVEMENT OF THE LAY INWEAVING LOOMS BACKGROUND OF THE INVENTION 1. Field of the Invention Theinvention relates to a drive for movement of the lay, especially forwire looms and looms for the manufacture of heavy thick fabrics, whichrequire a large stroke force, in which the movement of the thread isaccomplished through a double lever system driven by an eccentric andpivoted on one hand to the lay and on the other hand to the stand.

2. The Prior Art In weaving it is necessary to retard or even interruptthe movement of the lay to permit the drawing in of the filler threadsor wires in the rear dead center position. In the known wire looms aretardation of the movement of the lay is accomplished with the help ofa driven connecting rod engaging a two armed lever (German patent Nos.286,080 and 204,870. In this arrangement the drive allows in the fasterrunning web looms of the present day insufficient time for theintroduction of the weft threads or wires. Besides the running cycle isnot satisfactory.

Cam drives for looms'are also known, which however do not provide thenecessary high force for the manufacture of heavy thick webs. The knowncam drives are besides subject to very quick wear.

SUMMARY OF THE INVENTION The purpose of the invention is to provide adrive for looms for heavy thick webs such that even during fasteroperation of the loom a sufficient retardation or interruption of thethread movement sufficient for the introduction of the weft thread orwire is achieved.

The purpose according to the invention is achieved in that, in a driveof the previously known type as an eccentric drive, a driven cam isselected which exerts a positive force on a connecting rod, for examplepivoted on the stand, forming part of the double lever system.

The drive according to the invention has a very great lay rest period,which as compared to the rest period which can be achieved with theknown drive lies in the range of about 120. The greater rest periodresults even in a fast running loom in a trouble-free transfer of theweft threads or wires.

Basically the combination of a double-lever system and a driven cam as adrive for the movement of the lay provides the necessary high strokeforce and the protection of the cam drive during stopping. With thistype of drive it is also possible to have a satisfactory operatingcycle. The leg of the double-lever system connected to the lay can beconstructed in a known manner as a link, with which the leg of a guidecrank directed towards the double-lever system engages.

If a so-called groove or a so-called path cam is used, it is necessaryto arrange on the rear link of the doublelever system as a rollerengaging the cam. On the contrary with curved discs under certaincircumstances it is possible to use a sliding member of bronze or of asuitable plastic.

It is possible to produce the return movement of the lay by means oftension elements such as a tension spring. In this case only one camcooperating with the connecting rod pivoted on the stand is used.

A special construction according to the invention is an angle piece onthe leg of the double-lever system which is pivoted to the stand, thefree ends of which engage against two different cams, one of which workson the lay stop cam which operates on the leg of the single piece systemadjacent the double-lever system while the other cam which engages theother leg for the return movement.

Especially in wire weaving it may be necessary to work with a so-calleddouble stroke. This double stroke can be realized with the driveaccording to the invention, by making the connecting bolts of thedoublelever system connecting rod displaceable with respect to theextended position of the double-lever system out of the previouslymentioned connecting line between the lay link and the stand link beyondthe extended position. If the drive is provided with an arrangement ofconnecting bolts at the level of the aforesaid connec tion line betweenthe lay link and the stand link in the extended position of the bellcrank lever link, the basic stroke is achieved. If the connecting bolton the contrary is moved upwardly beyond the connecting line, thereresults in this arrangement the double stroke sought for, which resultsin the repeated cycle of the extended position of the double-leversystem in a single cycle of the cam which produces the movement of thelay.

Single and double strokes can also be realized if an adjustability ofthe roller adjacent to the double action lever system link with respectto the cam is provided, in which the use of an angle piece as theconnecting rod of the double action action lever system connected to thestand requires additionally an adjustability of the position of the legsof the angle piece with relation to one another, in order to ensure andmaintain an engagement of the roll on the cam discs without play, evenwith eccentric positioning of the rolls. The adjustability of theposition of the arms of the angle piece remains constant, if the roll iscentrally journalled and is provided for their axes in the arms of anglepiece slots on a radius of the stand link through the ideal axis point.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, the invention isfurther explained in schematic examples.

In the drawings:

FIG. 1 shows a drive arrangement for a single stroke in the rear deadcenter;

FIG. 2 shows the same drive in theforward dead center;

FIG. 3 shows a drive arrangement for double stroke in the rear deadcenter position;

FIG. 4 shows the system in the forward dead center position;

FIG. 5 shows such a system in the position where it has advanced overthe forward dead center position; and

FIG. 6 shows such a system in the position diametrically opposite theposition of FIG. 5 in the forward dead center position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, 11 is the weblay, which is pivoted at 12 on a web lay base and is swingable in thedirection of the arrow.

The swinging movement of the lay 11 is produced through the double leversystem 13, 14, 14 of which the lever 13 is pivoted at 16 at the free endof the lay 11 and the other lever 14, 14' at 17 on the loom frame, inconnection with the driven double cam 19, 19' of which the roll 141mounted on the lever arm 14 engages the cam 19 forces the lay 11 intothe forward dead center position (FIG. 2) while the roll 141' arrangedon the lever arm 14 engages cam 19 which positively forces the lay 1 lto the rear dead center positlOn.

The roller 141 and 141 are so arranged with respect to each other thatthey engage without play against the cam 19 and 19' which are secured toeach other.

The lever 13 and the angle lever 14, 14' which make up the crank leversystem are connected by a bolt 21, which engages through slots 22provided in the lever 13 and in the lever arm 14 in the bell crank lever14, 14' and can be secured at various positions therein.

With the arrangement as shown in FIGS. 1 and 2, the connecting bolt 21at the lower ends of the slots 22 operates the loom with a so-calledsingle stroke. In the forward dead center position (FIG. 2) the pivot16, the pivot 22 and the pivot 21 lie in the same plane, from which thereturn to the rear dead center position (FIG. 1) follows.

With the arrangement as shown in FIGS. 3 to 6, the connecting bolt 21 atthe upper ends of the slots 22 operates the loom with a so-called doublestroke. In this condition the double lever system 13,14,14' operates,beginning from a rear dead center position (FIG. 3), first the forwarddead center position (FIG. 4) where the lay 11 stops a first time, thenthe double lever system 13,14,14 swings over the extended position ofthe lever 13 and the lever arm 14 (the plane defined by the pivots16,21, 17) on beyond by the distance x (FIG. whereby the lay 11 is drawnback to the corresponding piece, whereas the lever 13 and the lever arm14 procccd further to the dead center position (FIG. 6), wherein asecond stoppage of the lay 11 occurs. Then follows further the returnmovement into the rear dead center position (FIG. 3).

I claim:

1. In combination with a loom frame and a lay pivoted on said frame, adrive mechanism comprising a double lever system including two links,means pivotally connecting the links together at one end, meanspivotally mounting a first of the links on the lay and the second linkon the frame for movement between a first position in which the linksare substantially aligned with each other and a second position in whichthey form a substantial angle with each other, and eccentric drive meansfor one of the links including means to exert a positive force on suchlink to produce movement of the lay.

2. A device as claimed in claim 1 in which said eccentric drive meanscomprises a disc cam.

3. A device as claimed in claim 1 including means to exert a forceacting in the opposite direction from said eccentric drive means.

4. A device as claimed in claim 1, having a part secured to said secondlink and extending at an angle thereto, and second eccentric drive meansfor said second link operating on said part to exert a force thereon toproduce movement of the lay in the opposite direction from that producedby the first link.

5. A device as claimed in claim 5 in which each of said force exertingmeans includes a disc cam.

6. A device as claimed in claim 5, in which said second link and saidpart have rollers thereon engaging the disc cams.

7. A device as claimed in claim 1, in which said means pivotallyconnecting the links includes a bolt and said links have slotstransverse to the line joining their pivot axes and said bolt isadjustable in said slots.

8. A device as claimed in claim 7 including means to exert a forceacting in the opposite direction from said eccentric. drive means.

9. A device as claimed in claim 7, having a part secured to said secondlink and extending at an angle thereto, and second eccentric drive meansfor said second link to produce movement of the lay in the oppositedirection from that produced by the first link.

10. A device as claimed in claim 9 in which each of said force exertingmeans includes a disc cam.

i i l i

1. In combination with a loom frame and a lay pivoted on said frame, a drive mechanism comprising a double lever system including two links, means pivotally connecting the links together at one end, means pivotally mounting a first of the links on the lay and the second link on the frame for movement between a first position in which the links are substantially aligned with each other and a second position in which they form a substantial angle with each other, and eccentric drive means for one of the links including means to exert a positive force on such link to produce movement of the lay.
 2. A device as claimed in claim 1 in which said eccentric drive means comprises a disc cam.
 3. A device as claimed in claim 1 including means to exert a force acting in the opposite direction from said eccentric drive means.
 4. A device as claimed in claim 1, having a part secured to said second link and extending at an angle thereto, and second eccentric drive means for said second link operating on said part to exert a force thereon to produce movement of the lay in the opposite direction from that produced by the first link.
 5. A device as claimed in claim 5 in which each of said force exerting means includes a disc cam.
 6. A device as claimed in claim 5, in which said second link and said part have rollers thereon engaging the disc cams.
 7. A device as claimed in claim 1, in which said means pivotally connecting the links includes a bolt and said links have slots transverse to the line joining their pivot axes and said bolt is adjustable in said slots.
 8. A device as claimed in claim 7 including means to exert a force acting in the opposite direction from said eccentric drive means.
 9. A device as claimed in claim 7, having a part secured to said second link and extending at an angle thereto, and second eccentric drive means for said second link to produce movement of the lay in the opposite direction from that produced by the first link.
 10. A device as claimed in claim 9 in which each of said force exerting means includes a disc cam. 